Sound-reproducing apparatus



i to preserve clarity and volume of sound re- Patented June 25, 1929.

UNITED STATES, PATENT OFF MORRIS M. GRU BER, OF NEW YORK, N.Y.,.ASSIGNOE TO SONORA.

' COMPANY, INC., A CORPORATION OF NEW YORK.

ICE.

SOUND-REPBODUCING APPARATUS.

Application filed Kay 4, 1925. Serial No. 27,714.

The recent rapid development of high The invention will first bedescribed in powered sending and receiving apparatus connection with theaccompanying drawings, for lathe-telephony has necessitated quiteillustrating one embodiment of the invenradical changes in the form ofthe receiver several views, and then more increased flux in the magnetsystem so as specifically defined and indicated in the appended claims.cept-ion. It is to accomplish these results In the drawings illustratingthis inventhat my present invention was designed, and tion one of theobjects of this invention is to Fig. 1 is a longitudinal sectional view.provide an improved, simple and effective Fig. 2 is a View taken on theline 22 means for magnifying the vibration of a Fig. 1 diaphragm withinan appropriate sound Fig. 3 is a view taken on the line chamber underproper acoustic conditions to" Fig. 1 with the horn support and coverplate mechanically and electrically reproduce removed. speech orsoundwaves electrically conveyed Fig. 4 is a "iew looking at the poleends to the instrument, delivered in a magnified of the magnet taken onthe line 4-4 Fig. 1. or amplified volume. Fig. is apartial sectionalView taken on This invention relates to sound reproduc the line 55 Fig.4. ing instruments and more particularly to Fig 6 is a plan view of thecover for the the telephonic receiving type used for an-' operatinparts, and Fig. 7 is a plan view D nouncmg' and commonly known asna.loud of the lower half of the ,magnet with the speaking receiver.

armature and coil in place. One of the objects of this invention is toAs' shown in the drawings 1 is a ring of provide a new andimproveddevice of this T section into one face of which is fitted typeof few and simple parts,

ri id; nd the cover plate 2, and in the opposite face is compactconstruction, and improved oper fitted the circular spider'plate 3. Thecover ation. plate 2 and the circular spider plate 3 are Another objectof my invention is to proheld firmly in place in the ring 1- by meansvide a telephonic receiver having a-permaf the screws 4. Securelyfastened to the nent magnet, each pole of' which is so machined to formtwo poles of like polarity havinga coil located between them topromanent magnet 6 and 7 respectively. Loduce the opposite effect in thepoles on both eated in- U shaped slots machined in the pole sides ofthearmature causing it to actuate ends of the upper and lower halves of thea diaphragm. In other words the magnetic magnet 6 and 7 is-the coil 8comprising the effect first pulls the armature in one direction and dueto the coil the magnetic forces are reversed and the armature is pulledback again.

lVith these and other objects in view, to

are the upper and lower halves of the per- The coil 8 is prevented frommoving endwise by the lugs 11 located on the outer faces of the sideflanges of the spool 10.

Flexibly mounted inthe core of the spool be more fullyset forthhereinafter, the in- 10, and centrally located is the armature 12scribed in the following specification and vention consists in the novelconstruction, to the inner end of which is securely fascombin'ation ofelements, and arrangement tened the connecting link 13 which passes ofparts which will be exemplified in the 'through the hole 14 in the lowerhalf 7 of operation and construction hereinafter de the magnet, and thehole 15 centrally located in the circular spider plate 3 for thatpurillustrated in the accompanying drawings, pose. (See F ig.' 5.) Thediaphragm 16 is considered together or separately. firmly fastened tothe connecting link 13 by The inventive idea involved is capable ofmeans of the shouldered portion thereof and receiving a variety ofmechanical expresthe screw-17. The periphery of the diasions, some ofwhich, for the purposes of ilphragm 16 is firmly held against laterallustration, are shown in the accompanying movement by the tubular rubberrings 18 drawings. which are compressed against it by the cover tion,wherein similar reference characters and the methods for the proper adustment are used to designate corresponding parts of the parts in orderto take care of the throughout the circular spider plate 3 by means ofthe screw PHWONOGRAPH line wire 9 tightly wound upon the spool 10.

. nuts 22. The line leads 23 leading from receiving circuit. not shownare connected plate 2 and the circular spider .plate 3. (See Fig. 1.)

The coil 8 is connected to the binding posts 19 located in two of thearms of the circular spider plate 3, by the'le'ads 20 attached to thebinding post Connections 21 which are held, in position by' the cheplk te to suitable binding post connections 24; which are held in position onthe binding posts 19 by the lockwashers 25 and check units 26. Thebinding posts 19 are insulated from the circular spider plate 3 by ofsaid cover guides for centrally -the diaphragm 16 vibrates.

means of the conical insulating plugs 27 and the insulating plates 28which also insulate the binding post connections 21 from said circularspiderplate 3. (Seelfig. 1. "he insulating plates 28 are of such shapeand size to allow 'for their being used as locating the magnet. as ismost clearly shown in Figures 2 and 4.

The metal cover 29, enclosing the operating parts'is fastenedto thecircular spider plate 3 bythe screws 30. In the side wall is an openingor hole '31 through which pass the line leads 23 (Figures 1, 2 and 5).The top of the cover 2%) has a series of holes 32 punched therein, whichmay be arranged in a circle as shown in Fig.6, which are covered by avery fine wire mesh 33, held in position by the wire ring 34 which issoldered in position. The purpose ofthese holes 32 is toallow air topass in or out of chamber formed by the cover 29 and the circular spiderplate 3 when The purpose of prevent particles the chamber the fine wiremesh 33 is to of dirt or dust from entering which in time would be agreat hinderance. -to the operation of the receiver.

The cover-plate 2 has integral therewith and centrally located,

the slotted collar 35 for the reception of a horn, an ear tube or thelike not shown in the drawings, and

held securely therein by the binding screw In accordance with theprovisions of the patent statutes, 1 have described the principle of myinvention together with the apparatus which I now. consider to representa practicalembodiment thereof, but/I desire it understood that myinvention is not confined to the particular form of apparatus hereinshown and described,'the same being merely illustrative, and that theinvention can be carried out departing from the spirit of my invention,

employ in other ways Without' and, therefore,I claim broadly the rightto all equivalent instrumentalities coming within the scope of theappended claims, and by means of which objects of my inventionareattained, and the new results accomplished, as herein set forth, as itis obvious that the particular embodiment herein shown and described isonly one of many that can be employedto attain these objects andaccomplish these results.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is 1. In adevice of the character described, areceiver of thetelephone type, a coil, a permanent magnet comprising twohalves and embracing said coil between its poles, a flexible armaturepositionedwithin the core of said coil, a diaphragm, and a link, passingthrough one of thehalves of said permanent magnet to connect saidarmature to said diaphragm. V

2. In a device of the character described, a receiver of the telephonetype, a coil, a permanent magnet comprising two halves heldin positionby one screw and embracing said coil between their poles, an armatureflexibly mounted in the core of said coil," a diaphragm, and a link,passing through one of the halves of said permanent magnet, to connectsaid armature to said diaphragm.

3. In a device ofthe character described, a receiver of the telephonetype, a coil. a permanent magnet having its poles slotted j to embracesaid coil, an armature flexibly mounted in the core and extending beyondthe sides of said coil, a connecting link rigidly fastened to one end ofthe armature and passing. through one leg of said magnet, and adiaphragmrigidly connected to the other end of said connecting link.

at. A permanent magnet for telephone re:

ce vers comprising a pair of substantially sponding recesses of theother, forming a.

U-shaped magnet with a coil chamber adja'cent its poles. i

This specification signed this 29 day of April, 1925.

MORRIS- GRUBER.

